:root {
    --bg-deep: #05050a;
    --bg-mid: #0a0a14;
    --accent-cyan: #00f5ff;
    --accent-purple: #9d4edd;
    --accent-warm: #ff9350;
    --digit-color: #f4f6ff;
    --digit-glow: rgba(0, 245, 255, 0.45);
    --elapsed-glow: rgba(157, 78, 221, 0.5);
    --chrome-opacity: 0.35;
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html,
body {
    height: 100%;
    background: var(--bg-deep);
    color: var(--digit-color);
    font-family: 'Inter', system-ui, sans-serif;
    overflow: hidden;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Chrome controls */
.home-escape,
.chrome-btn {
    position: fixed;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(8, 8, 16, 0.45);
    color: rgba(255, 255, 255, 0.75);
    opacity: var(--chrome-opacity);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: opacity 0.45s ease, border-color 0.3s ease, color 0.3s ease, transform 0.45s ease,
        visibility 0.45s ease;
    cursor: pointer;
    text-decoration: none;
}

body.chrome-hidden .home-escape,
body.chrome-hidden .chrome-btn {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: scale(0.92);
}

.home-escape {
    top: 1.25rem;
    left: 1.25rem;
}

.audio-toggle {
    top: 1.25rem;
    right: 1.25rem;
}

.audio-toggle .audio-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 0;
}

.audio-toggle .audio-icon--on {
    display: none;
}

.audio-toggle.is-audio-on .audio-icon--off {
    display: none;
}

.audio-toggle.is-audio-on .audio-icon--on {
    display: flex;
}

.home-escape:hover,
.home-escape:focus-visible,
.chrome-btn:hover,
.chrome-btn:focus-visible {
    opacity: 1;
    color: #fff;
    border-color: rgba(0, 245, 255, 0.35);
    outline: none;
    transform: scale(1.05);
}

/* Stage */
.countdown-stage {
    position: relative;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    isolation: isolate;
}

.countdown-stage.is-elapsed {
    --digit-glow: var(--elapsed-glow);
}

#particle-canvas {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}

.countdown-bg {
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(ellipse 80% 60% at 50% 120%, rgba(157, 78, 221, 0.18), transparent 60%),
        radial-gradient(ellipse 60% 50% at 15% 20%, rgba(0, 245, 255, 0.12), transparent 55%),
        radial-gradient(ellipse 50% 40% at 85% 75%, rgba(255, 86, 161, 0.08), transparent 50%),
        linear-gradient(180deg, #030308 0%, var(--bg-deep) 45%, #08081a 100%);
    overflow: hidden;
}

.nebula {
    position: absolute;
    border-radius: 50%;
    filter: blur(90px);
    opacity: 0.45;
    animation: drift 22s infinite ease-in-out alternate;
}

.nebula-1 {
    width: 55vw;
    height: 55vw;
    max-width: 520px;
    max-height: 520px;
    top: -12%;
    left: -8%;
    background: radial-gradient(circle, rgba(157, 78, 221, 0.55), transparent 70%);
}

.nebula-2 {
    width: 45vw;
    height: 45vw;
    max-width: 440px;
    max-height: 440px;
    bottom: -15%;
    right: -10%;
    background: radial-gradient(circle, rgba(0, 245, 255, 0.4), transparent 70%);
    animation-duration: 28s;
    animation-delay: -6s;
}

.nebula-3 {
    width: 35vw;
    height: 35vw;
    max-width: 320px;
    max-height: 320px;
    top: 40%;
    left: 55%;
    background: radial-gradient(circle, rgba(255, 147, 80, 0.25), transparent 70%);
    animation-duration: 18s;
    animation-delay: -12s;
}

@keyframes drift {
    0% {
        transform: translate(0, 0) scale(1);
    }

    100% {
        transform: translate(4%, 6%) scale(1.08);
    }
}

/* Timer display */
.countdown-display {
    position: relative;
    z-index: 2;
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: center;
    gap: clamp(0.75rem, 3vw, 2.5rem);
    padding: 2rem clamp(1rem, 4vw, 3rem);
    max-width: 100vw;
    overflow: visible;
}

.unit-column {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: clamp(3rem, 12vw, 6rem);
    overflow: visible;
    transition: opacity 0.45s ease, transform 0.45s ease, min-width 0.45s ease;
}

.unit-column.unit-exit {
    opacity: 0;
    transform: translateY(12px) scale(0.92);
    min-width: 0;
}

.digit-glow-host {
    overflow: visible;
    padding: 1.5rem 1rem;
    margin: -1.5rem -1rem;
    filter:
        drop-shadow(0 0 10px var(--digit-glow))
        drop-shadow(0 0 26px rgba(0, 245, 255, 0.4))
        drop-shadow(0 0 52px rgba(0, 245, 255, 0.18));
}

.digit-value {
    display: block;
    font-size: clamp(2.75rem, 11vw, 6.5rem);
    font-weight: 800;
    font-variant-numeric: tabular-nums;
    line-height: 1.15;
    letter-spacing: -0.03em;
    color: var(--digit-color);
}

.unit-label {
    margin-top: 0.5rem;
    font-size: clamp(0.65rem, 2vw, 0.85rem);
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: lowercase;
    color: rgba(255, 255, 255, 0.45);
}

.countdown-stage.is-elapsed .unit-label {
    color: rgba(200, 170, 255, 0.5);
}

.digit-glow-host.tick-pulse {
    animation: tick-glow 0.4s ease;
}

@keyframes tick-glow {
    0%,
    100% {
        filter:
            drop-shadow(0 0 10px var(--digit-glow))
            drop-shadow(0 0 26px rgba(0, 245, 255, 0.4))
            drop-shadow(0 0 52px rgba(0, 245, 255, 0.18));
    }

    50% {
        filter:
            drop-shadow(0 0 16px var(--digit-glow))
            drop-shadow(0 0 40px rgba(0, 245, 255, 0.55))
            drop-shadow(0 0 80px rgba(0, 245, 255, 0.28));
    }
}

.countdown-stage.is-elapsed .digit-glow-host {
    filter:
        drop-shadow(0 0 12px var(--elapsed-glow))
        drop-shadow(0 0 30px rgba(157, 78, 221, 0.45))
        drop-shadow(0 0 60px rgba(157, 78, 221, 0.2));
}

.noscript-fallback {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    text-align: center;
    background: var(--bg-deep);
    color: rgba(255, 255, 255, 0.7);
}

@media (min-width: 1024px) {
    .countdown-display {
        gap: clamp(1.5rem, 4vw, 4rem);
    }

    .unit-column {
        min-width: clamp(5rem, 9vw, 10rem);
    }

    .digit-value {
        font-size: clamp(6.5rem, 9vw, 10.5rem);
    }

    .unit-label {
        font-size: 0.95rem;
        margin-top: 0.75rem;
    }
}

@media (max-width: 520px) {
    .countdown-display {
        gap: 0.65rem 1.25rem;
    }

    .unit-column {
        min-width: clamp(2.5rem, 16vw, 4rem);
    }
}

@media (prefers-reduced-motion: reduce) {
    .nebula {
        animation: none;
    }

    .digit-glow-host.tick-pulse {
        animation: none;
    }

    .unit-column {
        transition: none;
    }

    #particle-canvas {
        display: none;
    }
}